气候变化领域集成服务门户(CCPortal): Upper mantle seismic anisotropy beneath the western and central North China Craton

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DOI	10.1016/j.tecto.2021.229025
	Upper mantle seismic anisotropy beneath the western and central North China Craton
	Qiang Z.; Wu Q.; Li Y.
发表日期	2021
ISSN	00401951
卷号	816
英文摘要	We estimate over 2,000 shear wave splitting parameters from 84 teleseismic earthquakes recorded at 465 temporary broadband stations distributed over the western and central North China Craton to constrain lithospheric deformation and mantle flow. In the interior of the Ordos Block, the W-E trending fast polarization directions with small delay times are indicative of stable terrane, where a thick Archean cratonic keel has been imaged. The dominant W-E fast orientations with relatively large delay times observed in southern Trans-North China Orogen show a systematic directional deviation of ~30° from the absolute plate motion (APM) direction and are explained by a combined effect of APM-induced mantle fabric and a mantle flow around the southeast edges of the Ordos Block. The prominent rift-orthogonal fast orientations beneath rifts to the northern Ordos Block imply the existence of active mantle flow. Also, it is inferred that a mantle plume is responsible for generating the parabolic fast direction pattern beneath the Datong Volcano. © 2021 Elsevier B.V.
关键词	Mantle flow Mantle plume North China Craton Ordos Block Seismic anisotropy Shear wave splitting
英文关键词	Earthquakes; Shear waves; Absolute plate motions; Broadband station; Lithospheric deformation; North China Craton; Polarization direction; Seismic anisotropy; Shear-wave splitting parameters; Teleseismic earthquakes; Shear flow
语种	英语
来源期刊	Tectonophysics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/208056
作者单位	Institute of Geophysics, Chinese Earthquake Administration, Beijing, 100081, China; Key Laboratory of Seismic Observation and Geophysical Imaging, Institute of Geophysics, China Earthquake Administration, Beijing, 100081, China
推荐引用方式 GB/T 7714	Qiang Z.,Wu Q.,Li Y.. Upper mantle seismic anisotropy beneath the western and central North China Craton[J],2021,816.
APA	Qiang Z.,Wu Q.,&Li Y..(2021).Upper mantle seismic anisotropy beneath the western and central North China Craton.Tectonophysics,816.
MLA	Qiang Z.,et al."Upper mantle seismic anisotropy beneath the western and central North China Craton".Tectonophysics 816(2021).